Exhaust hood



Aug. 1, 1950 R. P. ALLEN, JR, ET AL mus'r noon 2 Sheets-Shoat l- Filed March 26, 1948 j //v VENTORS R. P. ALLEJWJR. F. D. JOHNSTON W h. SOHN A 7' TORNEY Patented Aug. 1, 1950 I Rayinondfl Allen, Jim,

Essex, Fred DI Johnston,

' I. ApnlicationMarch 2s, 1948',.Seria1.-No. 17, 191 7 This" invention" relates to exhaust hoods; and

more particularly to" exhaustfhoods for catching andfcarrying' away; chips from cutting machines;

In' the use of cutting machines to cut" away portionseo'f "articles, thejchips'whichare' norm-ally formedmusthe. cleaned away' from the machine. lihihaust" hoods" have" been proposed": for carrying away such chips from cuttingmachines'. In' the past, exhaust hoods had' to'gfiticlbsely around the cutting elements off the machines? to" maintain sufficient air. velocity to carry away the chips. suchclosee-fittihg hoods. seriously interiered'with maintenance. operations on the machines;

An. object of the invention is to provide new and"improved'fexhausthocds,

Another ohjectr'of the invention is to provide new andimproved exhausthoodsfor catching and carrying away, chips from cutting machines.

A further, obj ectio'f the invention is to provide:

new and improvedexhaust hoods loosely enclosingicutters during the operationiofth'e cutters on workto permita'coess tothe' cutter and to remove effectively chips formedby thelcutt'er.

An exhausthood illustrating certain features oftheinvention may include a housing provided with a portion fittingiover a rotarycutter and 'alsohaving an opening therein to permit'a workzsupport vtosbe moved into;operat ive"relationship with tion of an exhaust hood forming a specific-em'- hodimentthereof when read in 'conjunctionzwith the appended drawings,iirwhiohi 1" is a vertical-section on apparatus ineluding an f? exhaust hood formin'g one emboodi ment thereof;

Fig. 2 is a front elevation of the apparatus, and

do i 3 is-a fragmentaryy plan of t tre?-apparatusa 7 Referring now in detail to the drawings, a bracket l0 secures a hood l2 to Ian overarm M of a milling machine, which includes :a cutting spindle I 6 having a cutter I 8 mounted thereon, which rotates in a clockwise direction, as viewed in Fig. 1. A work carriage 20 may be slid from the left, as viewed in Fig. 1, to move work 22 through an the cutter I-8, which cuts chips from the work and" throwsthem' toward" a tapered portion= 26" o the hood" l2. j

The hood l2 has an 'openingit at thebott'oma portionthereof to permit' the carriage to he moved into working" relationship'withrespectto the" cutter l 8, and to prevent chips from falling through the openingZB, a -pa-n 3'1] securedtbthe carriage fits tel-escopically'into the bottom 'por tionof "thehood and covers the opening 28"at all T times that the'cutter I B -ism engagement with :the= work;

' A'-duct '32 connected tU-a restricted portion 34- of the tapered portion 26 is connected to a header-2' 36 iii *which the'pres'sureis substantially-less than that of the" atinosphere; The suction inthe header 36 causes air tohe drawn through: the hood l2 and'through' the ducti-32- at a veryhigh velocity" so that"- the chips; which: are thrown toward the 'small end of the 1 tapered portion 28 ofthehobdl2 are-carridintothe header fromv thehoodli Part-ofthe chip's arecarried by'the stream directly into the header and" part fair cm the pan" 3'0" and the'carriagez The chips fa11-- in'gon' t'he panand the carriage are picked up'by the air stream travelling at" a high velocity over the pan-as the pan moved towar'd' th'e'small end or the tapered portion of the hood. Since the tapered portion= 2B of the' hood I 2 is mounted in facing relationship with respect to'th'e-chips'from the' worh "2 2 as-'th'e-=chips are-thrown by'the cutter; aguard portion 3T" of the hood I 2' enclosing" the cuttenl 8 may he=very= large: Phat-is, the chips thrown by thecutter I8 a-recarried bytherpam and the carriage sufiici'ently far into" the: tapered 3 portion T8 of the hood I 2 th permit-th'e' stream or a-ir flo ingm the portion of'the' lioo'd [2 ad jacent tb' th'e" cutter I8 to tra velat a=relativelir low velocity,- and-the ve'locityoffitheflair stream 40-" in the =portion 0fthe-=hood I2 overthe-panth is'i high so th'at 'ti-ie chip's-are Picked up'and carried into theheaderz a i The-hood lFis'provided with a large opening opening 4-0 by magnate-4 M is removed from' the hood, the spindle lBmayhe-detached from the machine and withdrawn with the cutter thereon for sharpening the cutter or other maintenance operations without dismantling the hood from the machine. The portion of the hood immediately adjacent to the cutter I 8 is substantially larger than the cutter I 8. Hence, removal of the spindle of the machine is facilitated, and

opening 24 in the hood l2 into engagement with 66 due to the position of the hood with respect to et 50 to increase the range of adjustmentlofthe front cover with respect to the bracket I so that the cover 56 may always be positioned close to the top of the work throughout a. wide variation in the height of work to be milled. The cover 50 increases the velocity of the air strearnover the carriage and acts as a guard against injury from contact with the cutter I8...

Certain features of the exhaust hood I 2 are disclosed and claimed in copending application Serial No. 17,195, filed March 26, 1948, by R. P.

Allen, Jr. and W. H. Sohn, for Exhaust Hoods.

What is claimed is: 1. In an apparatus including a milling cutter and means for moving work past the cutter,

whereby the cutter cuts ch-ipsfrom the work, an

improved exhaust hood, which comprises a ta- 2. In an apparatus including a cutter and a work holder for moving a workpiece past the cutter so that the cutter cuts chips from the workpiece, an improved exhaust hood, which comprises a, guard partially enclosing the cutter and having an adjustable covering on the approach side of the cutter for providing clearance iorthe workpiece, a housing [in communication with the, guard and having an entrance opening positioned beyond the operative portion of the, cutter for permitting the work holder and the workpiece to be moved at least partially into the housing, and means for applying a low pressure head to the housing to draw air rapidly through the housing to remove chips from the work and the work holder. l

3. In an apparatus including 'a cutter and a. work holder for moving a workpiece past the cutter so that the cutter cuts chips from the workpiece, an improved exhaust hood, which comprises a guard partially enclosing the cutter and having an adjustable covering on the approach side of the cutter for fitting the workpiece closely and for providing clearance for the workpiece, a. tapered housing in communication with the guard and provided with an opening in a wall thereof for permitting the ,work holder and the; workpiece to be moved at least partially into thev housing, a cover carried by the work holder for closing said opening, and means for applying a low pressure head to the housingto draw air rapidly through the housing to remove chips fromj the work and the work holder.

55, Number 4. In an apparatus including a cutter and a work holder for moving a workpiece past the cutter so that the cutter cuts chips from the workpiece, an improved exhaust hood, which comprises a guard partially enclosing the cutter and having an adjustableplate on the approach side cf thepcuttenfa tapered housing having the large end thereof in communication with the guard and also provided with a cutaway portion to permit the work holder to be moved into the housing, means for applying a low pressure head to the smaller end of the housing to draw air rapidly through the housing from the larger end thereof to the smaller end thereof, and a pan secured to the work holder and fitting telescopically with respect to the housing for keeping said ,opening in the housing covered.

5. In an apparatus including a spindle, a milling cutter and a work support reciprccable along a predetermined path for moving a workpiece past the cutter so that the cutter cuts chips from the workpiece; an improved exhaust hood, which comprises a tapered duct provided with a mouth of a predetermined height and a neck portion substantially less in height than the mouth mountedin alignment with thepath of the work support, the mouth of the duct being nearer than the neck portion to the cutter, and, a panprojecting. from the work support into the duct and fitting telescopically into theduct for carrying chips toward the neckportion oi the duct.

6. In an apparatus including a. rotary tool and a work carriage. movable from one side of the rotary tool to the other side thereof, the improved exhaust system which comprises a hood having a mouth and walls converging from the mouth to the other end thereof, the hood being so disposed that the mouth portion thereof substantially sur-. rounds the tool and the portion of the hood having converging walls catches the chips cut from work by the tool. said hood having an opening extending from the mouth thereof toward the small end'of the hoodforproviding clearance for the carriage and the work ,carried thereby, an exhaust tube connected tothe smallend of the hood, for removing chipsfallinginto the hood, and a sliding floor securedto thecarriage closing the opening in the hood.

RAYMOND P. ALLEN, JR.

FRED D. JOHNSTON. WILLIAM H. SOHN.

REFERENCES crrnn The" I following references are' of record file of this patent: r

f f 's'rarns' PATENTS I Numberr -Name Date 776,156 Venderbush '-'Nov. 29,.1904

. 789,741 Kaltenbach -May 16, 1905 F IQN PATENTS 7 Country 7 344,239. 568,218

in the Date Italy Oct. -29, 1936 Great Britain Mar. 23,1945- 

